MP6529 5-35V Brushless DC Motor Pre-Driver QFN-28

MP6529 5-35V Brushless DC Motor Pre-Driver QFN-28

The MP6529 is a gate driver IC designed for three-phase, brushless DC motor driver applications; it is capable of driving three half- bridges consisting of six N-channel power MOSFETs up to 35V.

Key Specifications

Features

• Wide 5V to 35V Input Voltage Range
• Bootstrap Gate Driver with Trickle-Charge Circuit Supports 100% Duty Cycle Operation
• Low-Power Sleep Mode for Battery- Powered Applications
• Programmable Over-Current Protection of External MOSFETs
• Adjustable Dead-Time Control to Prevent Shoot-Through
• Thermal Shutdown and UVLO Protection
• Fault Indication Output
• Thermally Enhanced Surface-Mount Package

Typical Application Circuit

Applications

• Three-Phase, Brushless DC Motors and Permanent Magnet Synchronous Motors
• Power Drills
• Impact Drivers

Design Notes

• Set dead time to match the external FET turn-off, not the datasheet typical. Too little risks shoot-through, too much distorts the current waveform at low duty cycle.
• Use a Kelvin connection for the current-sense resistor; shared copper injects switching noise straight into the sense amplifier.
• The thermal pad is the only heat path for most packages — via-stitch it to a ground plane with at least 9 vias.
• PWM frequency trades switching loss against current ripple in the motor inductance; 20 kHz keeps the drive out of the audible band.
• Add a brake or coast path so regeneration during a fast stop does not pump the supply rail.

Common Questions